> Gas is much cheaper per joule than electricity. There is actually a tip-over point. For a given price for gas, and a given price for electricity, each will b

> Gas is much cheaper per joule than electricity. There is actually a tip-over point. For a given price for gas, and a given price for electricity, each will be more economical at different points because the efficiency of heat pumps (for heating) is a function of the external temperature. There are calculations that can be done to determine this point: * https://c03.apogee.net/mvc/home/hes/land/el?utilityname=eversource&spc=hcc https://c03.apogee.net/mvc/home/hes/land/el?utilityname=ever... * https://masslandlords.net/heat-pump-vs-furnace/ https://masslandlords.net/heat-pump-vs-furnace/ It's not as clear-cut as you make it sound: * https://en.wikipedia.org/wiki/Coefficient_of_performance https://en.wikipedia.org/wiki/Coefficient_of_performance